I have a issue where the forklift quit driving when the driver made a quick shift from reverse to forward. Code 71 and 44 came up.

Diagnosed and Action:
Forward and reverse relay will not closed. All fuses were checked and relays were verified working by jump test. The diodes were removed and tested good. The drive motors spinned when the 1A, Regen and direction relay were jumped. I had replaced the all the SCR and capacitor with no luck. I want to replace the controller but hesitate because I not that familiar with Hyster machine. This is our first electric forklift as well. I do know all inputs to the to the card are correct based on the service manual reference. However, it seem the outputs to the relay ground is missing. Do the controller usually go bad? Thank you in advance